Linux can bring new life to a laptop/PC that is struggling to cope with windows.
Every computer bought in my family in the last couple of years came with 2GB ram standard. They ran Win7 fine - for a while. However, in every case, they gradually slowed down until it wasn't worth switching the thing on.
I could solve the problem by installing more ram or .........................
You think this was due to Windows updates?
My experience is that about every two years it pays to shift everything to a back up drive, then reformat the OS disk , reinstall Windows and reupdate the updates.
The problem seems to be gradual degradation or silting up of the registry structure.